Hand operated pressure producing pump



May 27, 1941. w. A. PATTON ETAL. 2,243,648

HAND OPERATED PRESSURE PRODUCING PUMP l Filed Jan. 12, 19:59 2 sheetssheet 1 L Js\\\\\\\\\\\\\\\ 2 Sheets-Sheet 2 I Filed Jan. 12, 1939 W. A. PATTON ErAL HAND OPERATED PRESSURE PRODUCING PUMP May 27, 1941.

: O ,9 f k\ v 7N 2 .1 1 1 .J\\IIUW l 1 v 8s \29 A; A V// //w////f///// ViLLis Patton V i Zia Patented May 27, 1941 2,243,648 HAND OPERATED PRESSURE PRODUCING PUMP .Willis a Patton, Cleveland, and William T.

Stephens, Geneva, Ohio Application January 12, 1939, Serial No. 250,660

(Cl. 10S-215) 6 Claims.

This invention relates to a hand operated pres'- sure producing pump, which is particularly adapted for. use in effecting the operation of hydraulic jacks, rams or elevating equipment.

. Pumps produced for this purpose usually require the careful machining ofl parts and are quite complicated 'due to the number of plungers, links, packings, valves and the like used in their manufacture. ADue to the mechanical complication and precisionwork necessary. the cost of manufacture of such pumps is quite high, .as well as the servicing and maintenance costs.

It is, therefore, an object of the present invention to provide a simple yet ecient hand operated pump wherein mechanical compllcationls avoided and manufacturing and maintenance costs reduced in comparison with previous equipment for comparable service.

For a further understanding of the invention, reference is to be had to the following description andthe accompanying drawings, wherein:

Fig.' 1 is a side elevationoi a pump constructed in accordance with the presentv invention and connected through piping to a hydraulic jack or lifting mechanism.

Fig. 2 is a vertical transverse sectional view taken through the pump on the plane indicated by the line 2-2 of Fig. 1,

Fig. 3 is a fragmentary top view of the`openlng in the cover of the pump housing showing the pump handle in dotted lines.

Fig. 4 is a fragmentary section of the ball and socket showing the liquid retaining means.

Fig. 5 is a vertical transverse sectional view of the pump taken on lines 5-5 in'Fig. 2.

Fig. 6 is a horizontal sectional view taken on line 6 6 of Fig. 5. l

Referring more specifically to the drawings, in which like numerals refer to like parts, our improved pump comprises a housing I preferably in the form ofa hollow metallic casting in order that the said housing may constitute a reservoir 2 for the reception of the liquid to be pumped. T he top of .the housing is formed with a threaded opening 3 by which liquid, such as oil, may be introduced into the reservoir 2, the opening 3 being normally closed by a removable plug 4.

.' Secured to the top wall of the housing I adjacent to an enlarged opening 5 lformed therein is a cover-6 which is provided with a depending chamber portion or member l. The-cover is secured to the housing I by means of screws 6a. A plate 8 is secured to the lower portion thereof by means of screws 9.' The plate!! and the lower portion of the depending member 1 are shaped to provide the opposite parts of a spherical seat IIl for the reception of a spherical enlargement II associated with and forming a part of a hand manipulated lever I2. Limited universal pivoting is thus provided. The lever I2 extends above the housing I, shown in Fig. 1, so that it. may be manually grasped and oscillated to effect a pumping operation. Situated in a circular recess I1 ing portion of the cover 'I adjacentthe spherical seat IIJ is a liquid retaining means I4 vcomprising a member I5 of angular cross section composed of leather, fabric or similar composition, and

associated therewith is a ring member I6 of rectangular cross section composed of a resilient material, preferably rubber or a similar composition, The rectangular member I6 is normally under compression which tendsto force the angular member I5 into intimate contact with the spherical enlargement II thereby forming ,a liquid seal. The lower end I2a of the lever 'I2 extends downward and is formed at its extremity in ahead I1. of frusto-concal shape, the said head I1 being in contact with a pair of oppositely disposed hollow or skirted pistons I8 (Figs. 5, 6). 'Ihese pistons are slidably received within longitudinally aligned cylinder bores I9, the open ends of said pistons being constantly disposed within said cylinder bores.

The outer ends of the bores I 9 are closed by means of removable plugs 20. Arranged between said plugs 20 and within the hollow portion 0f the pistons I8 are coil springs 2| which serve to maintain the closed ends of said pistons constantly in contact with the head I'I and end I2a on the lever I2, whereby the oscillation of the said lever and the movement of said pistons takes place against the resistance oiered by said springs. Communicating with the cylinder bores are inlet ports 22 which establishcommuncation between said bores and the reservoir 2. The ports 22 are provided with spring-pressed ball check valves 23 which provide for the passage of oil from. the reservoir 2 into .the cylinder bores upon the reciprocation of said pistons, but prevent reverse flow.

It will be seen that as the lever I2 is rocked, oil will be drawn into-one of the cylinder bores and expelled from the other. The oil discharged from said cylinder bores is advanced by way of the passages 24 to a high pressure pipe line 25 which is conected to the housing by means of a conventional coupling 25a and extends from the housing I to, for instance, a hydraulic ram as indicated' at 26, although, of course, the liquid under pressure may be used for effecting the operation of other appliances. The passages 24 include loaded, ball check valves 21 which are positioned in said passages to provide for the flow of oil from the cylinder bores I9 to the pipe line 25 but to preclude reverse ilow thereof.

Connecting the passages 24 with the reservoir 2 is a port 28 which is normally closed by a valve member 29, the said valve member being actuated by a spring 30 tending to maintain it normally ln the position of closure shown in Figs. 2 and 6.' 'Ihe valve member 29 has a stem portion 3|, extending inwardly of the reservoirl in register with the head I1 of the operating lever I2, and a face 32 appropriately seated in the housing I (Figs.I 2 and 6). There is a sliding t between stem; portion 3I and housing I. Immedlately below face 32, the valve member 29 is provided with a reduced or neck portion 33 that has one or more transverse passages 34 leading to a longitudinal bore 35 extending to the end of stern portieri 3|.

In the manner which has been indicated fluid may be discharged from the passages 24 into the reservoir Z past the valve face 32, into the passages 34 and through the bore 35 in the stem portion 3l, when the valve member 29 is moved to an open position. The operation of the pistons I8 and the lever head I1 does not interfere with the stern 3l,` as it is disposed at one side of said lever. In order to open the valve member 29, it is merely necessary to oscillate the lever I2 in a plane substantially at right angles to that employed in operating the pistons.

A three-lobed slot 36 in the cover member (Fig. 3) guides and limits the universal movement of the hand manipulated lever I2 to prevent loss of motion in operating the pistons I8,

or valve 29.

It will be noted that with this arrangement of parts, all operations may be carried out with one hand by the operator from a single point of control, i. e., the lever I2 acts as the pump handle and the release valve lever, thus eliminating the necessity of two levers or one lever and a separate release valve control.

It should also be noted that through the employment of the open-ended pistons, fluid pressure within the cylinder bore serves to expand the cylindrical skirts of the pistons I8 into iirm and intimatecontact with the walls of the cylindrical bores I9, so that it is not necessary to employ packing, piston rings and the like as is common practice in ordinary pumps.

Therefore, it will be seen from the foregoing disclosure that the present invention provides a hand operated pump of simple, compact and rugged construction which may be readily manufactured at low cost, easily operated, and one which will give extended service Without requiring repair. adjustment and replacement of parts.l

Although the invention has been described as embodied in a particular pump, it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described.

Having thus described our invention, what we claim is:

l. In a pump. a housing formed to include a liquid reservoir and opposed cylinders, pistons slidably mounted in said cylinders and projecting beyond the inner ends thereof, spring means arranged between said pistons and the outer ends of said cylinders, a unitary hand operated oscillatory lever arranged for universal movement and having the lower end thereof arranged between the inner ends of said pistons, an inlet uniting'each of said cylinders with said reservoir, said inlets being provided with check valves limiting the flow of uid therethrough to one direction, outlets leading from said cylinders, check valves in said outlets for limiting the ow ol' fluid therethrough to one direction, and a normally closed fluid return valve situated.' to close a port establishing communication `between said outlets and said'reservoir, said return valve being disposed contiguous to the lower end of said operating lever whereby proper movement of said lever will effect the opening of the return valve.

2. A pump comprising a housing formed to include a liquid containing reservoir, an opening in the top of said housing, a cover for said opening and having a depending portion projecting into the reservoir, a manually actuated operating lever extending into said reservoir, a universal joint formed in the bottom of the depending portion of the cover for the support of said lever, reciprocable pistons mounted in opposed relationship in the bottom of said housing and maintained in constant engagement with the lower end of said lever, and a check valve controlling the entrance of liquid into the reservoir and positioned for operation by the lower end of said lever when in an intermediateposition with respect to the pistons.

3. A pump comprising a housing formed to include a liquid containing reservoir, a cover for said reservoir housing, a manually actuated operating lever extending through said cover and into said reservoir, a swivelable joint formed between the cover of said housing and the lever for the support of said lever, liquid retaining means associated in intimate contact with the said swivelable joint, and reciprocable pistons mounted in opposed relation to the operating lever, and resilient means for maintaining the adjacent ends of said pistons in constant engagement with the lower end of said lever.

'4. A pump comprising a housing formed to include a liquid reservoir, an oscillatory lever pivotally carried by said housing 'and having its lower end disposed for rocking movement within said reservoir, aligned opposed cylinders arranged in said housing, expansible, skirted pistons slidably mounted within said cylinders, and spring means cooperative with said pistons for maintaining the inner ends thereof in constant contact with the. lower end of said operating lever, whereby the oscillation of said lever would impart reciprocatory movement to said pistons.

5. A pump comprising a housing formed to include a liquid reservoir, a lever supported in said housing for universal movement and having its lower end within said reservoir, opposed cylinders arranged in said housing, pistons slidably m'ounted within said cylinders, resilient means cooperative with said pistons for maintaining the innerends of the latter in constant contact with the lower end of said lever, whereby the oscillation of said lever in one plane would impart reciprocatory movement to said pistons, valve means for charging and discharging said cylinders, and check valve means arranged to be operated by oscillation of the lever in another plane.

6. In a pump for operating and controlling hydraulic apparatus, a housing formed to include a liquid reservoir, opposed cylinders and pistons within said housing, a one-way inlet in each cylinder, a one-way outlet for each cylinder,- a high pressure line connection in the housing, passages in the housing leading from each cylinder tact the adjacent ends of the pistons and the valve means, and a cover member for the housing having a slot therein for Hunting the m'ovement of the operating lever to that required for to said high pressure line connections, valve 5 operation of the pistons and valvemeans.

means within the housing for returning liquid in the passages to the reservoir, an operating lever pivotally supported in the housing so as to con- WILLIS A. PA'ITON. WILLIAM T. STEPHENS. 

